[mythtvnz] Mythbackend breaks after upgrade

[Graeme Woollett]

I'm running 10.04 with JYA's packages, I upgraded and get the following-

tail -f /var/log/mythtv/mythbackend.log
2010-05-23 13:41:30.589 mythbackend version: branches/release-0-23-fixes 
[24710] www.mythtv.org
2010-05-23 13:41:30.590 Using runtime prefix = /usr
2010-05-23 13:41:30.602 Using configuration directory = /.mythtv
2010-05-23 13:41:30.624 Cannot locate your home directory. Please set 
the environment variable HOME
2010-05-23 13:41:30.646 Failed to init MythContext, exiting.
2010-05-23 13:41:30.834 mythbackend version: branches/release-0-23-fixes 
[24710] www.mythtv.org
2010-05-23 13:41:30.835 Using runtime prefix = /usr
2010-05-23 13:41:30.846 Using configuration directory = /.mythtv
2010-05-23 13:41:30.857 Cannot locate your home directory. Please set 
the environment variable HOME
2010-05-23 13:41:30.868 Failed to init MythContext, exiting.

I've never had this error before, how do I fix it?

Thanks
Graeme